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Find the value of p , the mean of the fo...

Find the value of `p` , the mean of the following distribution is 7.5 x: 3 5 7 9 11 13 f: 6 8 15 `p` 8 4

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Given mean `bar(x)=7.5`
`7.5=(303+9p)/(41+p)`
`⟹ 7.5(41+p)=303+9p`
`⟹ 307.5−303=9p−7.5p` ...
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